Abstract
Due to microstructural damages in composite structures, for example caused by cyclic loads, material degradation may occur, changing material properties. Over time these damages are likely to accumulate and can lead to an abrupt structural failure. Therefore, it is necessary to investigate or detect material degradation as a result of cyclic loading at an early stage. For this purpose, the generation of so-called cumulative second harmonic modes [1] is employed. In this work the authors will deal with numerical simulation of Lamb-wave propagation in symmetric cross-ply laminates (CPL). Based on existing work in this area for isotropic and unidirectional materials [2], the numerical investigation is extended to CPL. The aspects of material stability as well as of conditions of existence regarding cumulative second harmonic generation in CPL will be discussed.
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